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Research Papers: Hydrodynamic Lubrication

Three-Dimensional Thermohydrodynamic Morton Effect Analysis—Part II: Parametric Studies

[+] Author and Article Information
Junho Suh

Mem. ASME
Texas A&M University,
College Station, TX 77840
e-mail: menartek@tamu.edu

Alan Palazzolo

Mem. ASME
Professor
Department of Mechanical Engineering,
Texas A&M University,
College Station, TX 77840
e-mail: a-palazzolo@tamu.edu

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received March 17, 2014; final manuscript received March 17, 2014; published online April 25, 2014. Assoc. Editor: Michael Khonsari.

J. Tribol 136(3), 031707 (Apr 25, 2014) (16 pages) Paper No: TRIB-14-1061; doi: 10.1115/1.4027310 History: Received March 17, 2014; Revised March 17, 2014; Accepted March 23, 2014

This paper presents simulation results corresponding with the theoretical Morton effect model explained in Part I, where the 3D finite element models of bearing, shaft, and fluid film are adopted. In addition, it explains how thermal bow induced imbalance force develops in the spinning journal with time and how the vibration level is affected by the thermal bow vector. Shaft asymmetric thermal expansion induced by nonuniform journal heating is simulated, which is one of the unique contributions of this research. The effect of changes in: (1) thermal boundary condition around the pad, (2) lubricant supply temperature, (3) initial mechanical imbalance, (4) pivot stiffness, (5) film clearance, and (6) pad material are studied. Cooling the pad and the lubricant, using a pad with a low thermal expansion coefficient, soft pivot, and reducing the initial imbalance are found to be the best remedies for the thermal induced synchronous rotor instability problem.

Copyright © 2014 by ASME
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References

Figures

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Fig. 1

Longitudinal section of rotor model

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Fig. 2

Rotor-bearing thermal boundary condition

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Fig. 4

Mode shape at 7291 rpm (ζ = 0.10)

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Fig. 5

Transient Morton effect simulation result (7500 rpm versus 8500 rpm)

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Fig. 6

Phase relationship

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Fig. 7

Temperature differential and phase information (case 1: 7500 rpm)

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Fig. 8

Temperature differential and phase information (case 2: 8500 rpm)

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Fig. 9

Asymmetric shaft thermal expansion

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Fig. 10

The effect of thermal boundary condition

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Fig. 11

Inlet temperature effect on the synchronous thermal instability problem

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Fig. 12

Comparison of different initial imbalance

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Fig. 14

Flexible pivot versus rigid pivot

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Fig. 15

Film clearance effect on the Morton effect problem

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Fig. 16

Pad material effect on the Morton effect problem

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